What Is The Difference Between Substation And Substation, And What Are The Functions Of Each?
Place where the voltage is changed. In order to transmit the electric energy from the power plant to a far place, the voltage must be increased to high-voltage electricity, and the voltage must be reduced as needed near the user. This work of raising and lowering the voltage is done by the substation. The main equipment of the substation is the switch and the transformer.
According to different scales, the small ones are called substations. The substation is larger than the substation. Substation: generally a step-down substation with a voltage level below 110KV; substation: includes "boost and step-down" substations of various voltage levels.
A substation is a power facility in the power system that transforms voltage, receives and distributes electrical energy, controls the flow of power, and adjusts the voltage. It connects the power grids of various voltages through its transformers. The substation is in a specific environment; it is the process of AC-DC-AC conversion. Like submarine transmission cables and long-distance transmission. Some adopt the form of high-voltage direct current transmission and transformation. DC transmission overcomes the capacitive reactance loss of AC transmission. It has an energy-saving effect.
Substations are mainly high-voltage substations with medium voltage, or high-voltage substations with low-level high-voltage. Substations occupies a large area, and they occupy different areas according to different voltage levels and capacities, so some people will call them substations.
From the perspective of power supply economy, the substation should be close to the load center. From the perspective of production, the substation should not hinder production and transportation within the plant, and the transportation of its own equipment should also be convenient. From a safety perspective, substations should avoid flammable and explosive places. The substation should be located on the upwind side of the unit. In an enterprise, it is not easy to set up in a place where dust and fibers are easy to deposit. Substations should not be located in crowded places. The site selection and construction of substations should also take into account the requirements for fire extinguishing, corrosion prevention, pollution prevention, waterproofing, rain prevention, snow prevention, earthquake prevention, and prevention of small animals from entering.
Function: The substation is a transition device that connects the power plant to the user. Because the power plant is very far away from the city and factory where electricity is used, and the voltage generated by the power plant is not high, the current is very large. If the current is large, a large amount of heat will be generated on the transmission line according to Joule's law. The transmission line is damaged, and the conversion of current into heat is also a loss. Therefore, it is necessary to increase the voltage of the power plant through the substation to 500,000 volts, and then transmit it to the cities and factories where we live for a long distance, and then pass through the local substation. The voltage is reduced and compiled into our daily 220V voltage through power distribution and other measures.
Substation
It is the place and place where the voltage is changed. It is a place where the voltage and current of electric energy are transformed, concentrated and distributed in the electric power system. In order to ensure the quality of electric energy and the safety of equipment, voltage adjustment, current control, and protection of transmission and distribution lines and main electrical equipment are also required in the substation. According to the purpose, it can be divided into power substation and traction substation (for electric railway and tram). The term definition stipulated in the national standard GB50053-2013 "Code for Design of Substations 20kv and Below" is "the AC power source of 20kv and below is transformed by the power transformer to supply power to the electrical equipment." .
Function: The substation is a place where the voltage and current of electric energy are transformed, concentrated and distributed in the electric power system. In order to ensure the quality of electric energy and the safety of equipment, voltage adjustment, control, transmission and distribution lines and main electrical equipment are also required in the substation. Generally, the voltage does not exceed one or two kilovolts. If it is directly transmitted over a long distance, the line current will be very large, which makes the power loss on the line very large, uneconomical, and the line transmission power is very low. Therefore, a transformer must be used to increase the voltage to tens of thousands of volts or even hundreds of thousands of volts (depending on the distance and power) to reduce the line current. In order to connect power lines of different distances and powers into the grid to increase overall safety, multiple substations are required to match and connect lines of different levels. Similarly, after high-voltage electricity is delivered to the destination, it needs to be decompressed in order to meet the needs of different users. Generally, the main substation refers to the primary transformer, and there are secondary transformers under it. The primary transformer is used to switch high-voltage distribution and is not responsible for voltage transmission.
